The ideal tank size for spirulina farming depends on production goals. Small-scale hobby farms can start with 1,000-5,000 litres (10-50 sq. m. tanks), while commercial farms require multiple tanks ranging from 4lakh to 8lakh litres for viability and to meet market demand. Tanks should be food-grade, contamination-free, and have an efficient agitation system to ensure even nutrient distribution. The depth should be around 20-30 cm, allowing optimal light penetration for photosynthesis. Regular pH, temperature, and contamination checks are crucial for consistent yields.